s]
| any of numerous retroviruses of the picornavirus group, some harmless and others associated with various human disorders, as aseptic meningitis. |

echovirus ech·o·vi·rus (ěk'ō-vī'rəs) or ECHO virus (ěk'ō)
n.
Any of a number of retroviruses of the family Picornaviridae, inhabiting the gastrointestinal tract and associated with various diseases, such as viral meningitis, mild respiratory infections, and severe diarrhea in newborns.